<?php
class MysqlNew {
    private $db_host; //数据库主机
    private $db_user; //数据库用户名
    private $db_pwd; //数据库用户名密码
    private $db_database; //数据库名
    private $conn; //数据库连接标识;
    private $result; //执行query命令的结果资源标识
    private $sql; //sql执行语句
    private $row; //返回的条目数
    private $coding; //数据库编码，GBK,UTF8,gb2312
    private $bulletin = true; //是否开启错误记录
    private $show_error = true; //测试阶段，显示所有错误,具有安全隐患,默认关闭
    private $is_error = true; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的

    /*构造函数*/
    public function __construct($db_host, $db_user, $db_pwd, $db_database, $coding, $conn=null) {
		$this->db_host = $db_host;
        $this->db_user = $db_user;
        $this->db_pwd = $db_pwd;
        $this->db_database = $db_database;
        $this->conn = $conn;
        $this->coding = $coding;
        $this->connect();
    }

    /*数据库连接*/
    public function connect() {
        $hostport = explode(":", $this->db_host);
        if (empty($hostport[1])) {
            $hostport[1] = 3306;
        }
        if ($this->conn == "pconn") {
            //永久链接
            $this->conn = mysqli_connect($hostport[0], $this->db_user, $this->db_pwd, $this->db_database, $hostport[1]);
        } else {
            //即使链接
            $this->conn = mysqli_connect($hostport[0], $this->db_user, $this->db_pwd, $this->db_database, $hostport[1]);
        }

        mysqli_query($this->conn, "SET NAMES $this->coding");
    }

    /*数据库执行语句，可执行查询添加修改删除等任何sql语句*/
    public function query($sql) {
        if ($sql == "") {
            $this->show_error("SQL语句错误：", "SQL查询语句为空");
        }
        $this->sql = $sql;

        $result = mysqli_query($this->conn, $this->sql);

        if (!$result) {
            //调试中使用，sql语句出错时会自动打印出来
            if ($this->show_error) {
                $this->show_error("错误SQL语句：", $this->sql);
            }
        } else {
            $this->result = $result;
        }
        return $this->result;
    }

    /*创建添加新的数据库*/
    public function create_database($database_name) {
        $database = $database_name;
        $sqlDatabase = 'create database ' . $database;
        $this->query($sqlDatabase);
    }

    /*查询服务器所有数据库*/
    //将系统数据库与用户数据库分开，更直观的显示？
    public function show_databases() {
        $data = array(
            'total'=>0,
            'database'=>null,
        );

        $this->query("show databases");
        $data['total'] = $amount = $this->db_num_rows();

        while ($row = $this->fetch_array()) {
            $data['database'][] = $row['Database'];
        }

        return $data;
    }

    //以数组形式返回主机中所有数据库名
    public function databases() {
        $rsPtr = mysql_list_dbs($this->conn);
        $i = 0;
        $cnt = mysqli_num_rows($rsPtr);
        while ($i < $cnt) {
            $rs[] = mysql_db_name($rsPtr, $i);
            $i++;
        }
        return $rs;
    }

    //update影响行数
    public function row_count(){
        return mysqli_affected_rows($this->conn);
    }

    /*查询数据库下所有的表*/
    public function show_tables($database_name) {
    	$data = array(
            'name'=>$database_name,
            'total'=>0,
            'database'=>null,
        );

        $this->query("show tables");
        $data['total'] = $amount = $this->db_num_rows();

        while ($row = $this->fetch_array()) {
            $columnName = "Tables_in_" . $database_name;
            $data['database'][] = $row[$columnName];
        }

        return $data;
    }

    /*取得结果数据*/
    public function mysql_result_li() {
        return mysqli_result($str);
    }

    /*取得记录集,获取数组-索引和关联,使用$row['content'] */
    public function fetch_array($resultt="") {
        if($resultt<>""){
            return mysqli_fetch_array($resultt);
        }else{
            return mysqli_fetch_array($this->result);
        }
    }

    //获取关联数组,使用$row['字段名']
    public function fetch_assoc() {
        return mysqli_fetch_assoc($this->result);
    }

    //获取数字索引数组,使用$row[0],$row[1],$row[2]
    public function fetch_row() {
        return mysqli_fetch_row($this->result);
    }

    //获取对象数组,使用$row->content
    public function fetch_Object() {
        return mysqli_fetch_object($this->result);
    }

    //简化查询select
    public function findall($table) {
        return $this->query("SELECT * FROM $table") ? true : false;
    }

    //简化查询select
    public function select($table, $columnName = "*", $condition = '', $debug = '') {
        $condition = $condition ? ' Where ' . $condition : NULL;
        if ($debug) {
            return "SELECT $columnName FROM $table $condition";
        } else {
          	return  $this->query("SELECT $columnName FROM $table $condition");
        }
    }

    //简化删除del
    public function delete($table, $condition) {

        return $this->query("DELETE FROM $table WHERE $condition") ? true : false;
           
    }

    //简化插入insert
    public function insert($table, $columnName, $value) {
        $res = $this->query("INSERT INTO $table ($columnName) VALUES ($value)");

        if($res) {
            return $this->insert_id();
        } else {
            return false;
        }
            
    }

    //简化修改update
    public function update($table, $mod_content, $condition) {
		return $this->query("UPDATE $table SET $mod_content WHERE $condition") ? true : false;
    }

    /*取得上一步 INSERT 操作产生的 ID*/
    public function insert_id($result='') {
    	if($result <> '')
    		return mysqli_insert_id($result);
    	else 
        	return mysqli_insert_id($this->conn);
    }

    //指向确定的一条数据记录
    public function db_data_seek($id) {
        if ($id > 0) {
            $id = $id -1;
        }
        if (!@ mysqli_data_seek($this->result, $id)) {
            $this->show_error("SQL语句有误：", "指定的数据为空");
        }
        return $this->result;
    }

    // 根据select查询结果计算结果集条数
    public function db_num_rows() {
        if ($this->result == null) {
            if ($this->show_error) {
                $this->show_error("SQL语句错误", "暂时为空，没有任何内容！");
            }
        } else {
            return mysqli_num_rows($this->result);
        }
    }

    // 根据insert,update,delete执行结果取得影响行数
    public function db_affected_rows() {
        return mysqli_affected_rows($this->conn);
    }

    //释放结果集
    public function free() {
        @ mysqli_free_result($this->result);
    }

    //数据库选择
    public function select_db($db_database) {
        return mysqli_select_db($db_database);
    }

    //查询字段数量
    public function num_fields($table_name) {
    	$data = array('total'=>0, 'fields'=>null);

        $this->query("SHOW COLUMNS FROM {$table_name}");
        $data['total'] = $total = mysqli_num_fields($this->result);

        for ($i = 0; $i < $total; $i++) {
            $data['fields'][] = mysqli_fetch_field($this->result, $i);
        }

        return $data;
    }

    //取得 MySQL 服务器信息
    public function mysql_server($num = '') {
        switch ($num) {
            case 1 :
                return mysqli_get_server_info(); //MySQL 服务器信息
                break;

            case 2 :
                return mysqli_get_host_info(); //取得 MySQL 主机信息
                break;

            case 3 :
                return mysqli_get_client_info(); //取得 MySQL 客户端信息
                break;

            case 4 :
                return mysqli_get_proto_info(); //取得 MySQL 协议信息
                break;

            default :
                return mysqli_get_client_info(); //默认取得mysql版本信息
        }
    }

    //输出显示sql语句
    public function show_error($message = "", $sql = "") {
        if (!$sql) {
            echo "<font color='red'>" . $message . "</font>";
            echo "<br />";
        } else {
            echo "<fieldset>";
            echo "<legend>错误信息提示:</legend><br />";
            echo "<div style='font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;'>";
            echo "<div style='height:20px; background:#000000; border:1px #000000 solid'>";
            echo "<font color='white'>错误号：12142</font>";
            echo "</div><br />";
            echo "错误原因：" . mysqli_error() . "<br /><br />";
            echo "<div style='height:20px; background:#FF0000; border:1px #FF0000 solid'>";
            echo "<font color='white'>" . $message . "</font>";
            echo "</div>";
            echo "<font color='red'><pre>" . $sql . "</pre></font>";
            $ip = getip();
            if ($this->bulletin) {
                $time = date("Y-m-d H:i:s");
                $message = $message . "\r\n$this->sql" . "\r\n客户IP:$ip" . "\r\n时间 :$time" . "\r\n\r\n";

                $server_date = date("Y-m-d");
                $filename = $server_date . ".txt";
                $file_path = "error/" . $filename;
                $error_content = $message;
                //$error_content="错误的数据库，不可以链接";
                $file = "error"; //设置文件保存目录

                //建立文件夹
                if (!file_exists($file)) {
                    if (!mkdir($file, 0777)) {
                        //默认的 mode 是 0777，意味着最大可能的访问权
                        die("upload files directory does not exist and creation failed");
                    }
                }

                //建立txt日期文件
                if (!file_exists($file_path)) {

                    //echo "建立日期文件";
                    fopen($file_path, "w+");

                    //首先要确定文件存在并且可写
                    if (is_writable($file_path)) {
                        //使用添加模式打开$filename，文件指针将会在文件的开头
                        if (!$handle = fopen($file_path, 'a')) {
                            echo "不能打开文件 $filename";
                            exit;
                        }

                        //将$somecontent写入到我们打开的文件中。
                        if (!fwrite($handle, $error_content)) {
                            echo "不能写入到文件 $filename";
                            exit;
                        }

                        //echo "文件 $filename 写入成功";

                        echo "——错误记录被保存!";

                        //关闭文件
                        fclose($handle);
                    } else {
                        echo "文件 $filename 不可写";
                    }

                } else {
                    //首先要确定文件存在并且可写
                    if (is_writable($file_path)) {
                        //使用添加模式打开$filename，文件指针将会在文件的开头
                        if (!$handle = fopen($file_path, 'a')) {
                            echo "不能打开文件 $filename";
                            exit;
                        }

                        //将$somecontent写入到我们打开的文件中。
                        if (!fwrite($handle, $error_content)) {
                            echo "不能写入到文件 $filename";
                            exit;
                        }

                        //echo "文件 $filename 写入成功";
                        echo "——错误记录被保存!";

                        //关闭文件
                        fclose($handle);
                    } else {
                        echo "文件 $filename 不可写";
                    }
                }

            }
            echo "<br />";
            if ($this->is_error) {
                exit;
            }
        }
        echo "</div>";
        echo "</fieldset>";

        echo "<br />";
    }

    /*
     * 析构函数，自动关闭数据库,垃圾回收机制
     */
    public function __destruct() {
        if (!empty ($this->result)) {
            $this->free();
        }
    }
}